The simplest explanation of network marketing is that it is a method of marketing that utilizes independent representatives to reach potential customers.
Network marketing is a legitimate business, it isn't a con such as a "pyramid scheme"; and it is also known as Multi-Level Marketing (MLM).
It is a business model where independent contractors buy into a company's "value proposition" and earn a commission on the products they sell. It is based on providing people with real, legitimate products.
Your own financial benefit from MLM is always the result of your own dedicated efforts in building an organisation that sells real products and services.
This is a great book about network marketing, honest and direct; with a great sense of humour, the author tells about his own failures and successes, leading you to your own path into the business.